England seamer Stuart Broad was missing from training in Mumbai on Thursday morning but is not thought to be a major doubt for the second Test against India.
The vice-captain was a fitness doubt for the series opener in Ahmedabad due to a heel injury sustained in a warm-up fixture against Mumbai A but was able to play a full part.
His absence from nets is not thought to be related to that problem, with an England spokesman describing his condition as "under the weather".
With Steven Finn ruled out of the match and England already 1-0 down in the four-match series, the tourists will be desperate for Broad to be at the peak of his powers.
Should there be any deterioration in his condition, Surrey quick Stuart Meaker and Durham's Graham Onions are standing by.
Captain Alastair Cook spoke of his confidence this morning that England are capable of much better than in their first-Test defeat.
"We have been working hard in training; we have been doing the right things," he said.
England's middle order was the principal cause of concern in Ahmedabad, numbers three to six mustering just 68 runs between them in their eight combined attempts.
"It's about transferring that out into the middle and being able to get into the rhythm of batting out there," added Cook, who made more than 200 runs himself - including a second-innings 176. "I am confident. The guys have done it in the past."